A new study shows that people who do not get a good night’s sleep SHOULD EAT BREAKFAST BEFORE drinking coffee. That applies to almost everyone in Hong Kong, but especially to domestic helpers. Drinking coffee before eating breakfast messes up your blood sugar, and could have long term bad effects on your health. So eat breakfast first, then enjoy your coffee.

https://www.inverse.com/mind-body/science-reveals-the-perfect-time-to-drink-coffee-for-a-healthy-metabolism